Scarifier for bulldozers



June 6,1950 D WAY 2,510,445

SCARIFIER FOR BULLDOZER-S Filed 001',- 30, 1944 In z'elltor WWW Patented June 6, 1950 UNITED STATES PATENT omen] 1 sel mm fij i moms V Darl- Way, Henderson, Ky., assignorof one-half to Glen 0. Lohmann, Henderson, Ky.

Application October so, 1944, Serial No. 1,103

This invention relates to a scarifier for bulldozers, and more particularly to such a device adapted to be associated with the blade of a bulldozer.

' A primary object of this invention is the provision of a scarifier adapted to be secured to the rear or convex portion of a bulldozer blade, and provided with a plurality of teeth, adapted to engage in the earth to loosen the same when the tractor or other source of motive power for the bulldozer blade is backing up in order to loosen the earth for the next forward movement of the bulldozer.

An additional object is the provision of spring means in association with such scarifiers adapted to avoid the same penetrating the ground during the forward motion of the bulldozer blade while urging penetration of the ground upon backward motion of the blade.

Other objects reside in the combinations of elements, arrangements of parts, and features of construction, all as will be more fully pointed out hereinafter, and disclosed in the accompanying drawings, wherein there is shown a preferred embodiment of this inventive concept.

In the drawings Figure 1 is a rear elevational view of a bulldozer blade, showing the device of the instant invention attached thereto.

Figure 2 is an end elevational view of the device shown in Figure 1.

Figure 3 is an enlarged sectional view taken substantially along the line 3--3 of Figure 1, as

viewed in the direction indicated by the arrows,

- throughout the several views of the drawings.

Having reference now to the drawings, there is generally indicated at ID a bulldozer blade,

adapted to be secured in any desired manner to a bulldozer, or tractor or other desired source of motive power therefor. Secured to the back or convex side of the blade at a position adjacent ground level is an angle iron ll, secured to the underside of which are a plurality of pairs of supporting brackets l2. Extending through aligned openings in the walls of brackets 12, is a rock shaft III to which a plurality of scarifying teeth H are secured as by clamps l5 and bolts I6. The shaft l3 extends through all the pairs of supporting brackets I2 and has secured to each extremity thereof an arm or lever 20. An angle iron stop 23 (see Figure 3) extends between each pair of 4 Claims. (01. 37-145) brackets, in order to limit the movement 2 of the teeth toward the blade during rearward movement of the blade Ill.

Now from the foregoing it will be seen that the mechanism comprising the instant inventive concept has no efiect on the forward movement of the bulldozer blade ill, but when the bulldozer is backed the teeth l4 engage the surface of the ground, and scarify the same to loosen it for the next forward movement of the bulldozer blade.

Thus it will be seen that there is herein provided a device accomplishing all the objects of this invention and others including many advantages of great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbefore shown and described, it is to be understood that all mate ter herein is to be interpreted merely as illustrative and not in a. limiting sense.

I claim:

1. The combination with an earth scraping blade, of a shaft mounted on the rear side of the blade adjacent its lower earth contacting edge to rock about an axis which lies parallel with the blade, a plurality of longitudinally spaced scarifier teeth fixed to the shaft, arms extending outwardly from the shaft and yielding means connecting the blade and each arm to hold the teeth in earth scarifying position below the lower earth contacting edge of the blade.

2. The combination with an earth scraping blade, of a shaft mounted on the rear side of the blade adjacent its lower earth contacting edge to rock about an axis which lies parallel with the blade, a plurality of longitudinally spaced scarifier teeth fixed to the shaft, arms extending outwardly from the shaft in a direction substantially perpendicular to the teeth, yielding means connecting the blade and the arms to hold the teeth in earth scarifying positions and stop means for limiting the movement of the teeth toward the earth contacting edge of the blade.

3. The combination with an earth scraping blade, of a shaft mounted on the rear side of the blade adjacent its lower earth contacting edge to rock about an axis which lies parallel with the b1ade,a plurality of longitudinally spaced scarifier teeth fixed to the shaft, arms extending outwardly from the shaft in a direction substantially perpendicular to the teeth, guide brackets secured to the rear side of the earth scarifying blade near its upper edge, a guide rod pivotally connected to each arm and slidable through a guide bracket and a compression coil spring surrounding each guide rod yieldingly to urge the arms downwardly and the scarifying teeth in to earth scarifying position below the lower earth contacting edge of the blade.

4. The combination with an earth scraping blade, of a shaft mounted on the rear side of the blade adjacent its lower earth contacting edge to rock about an .axis which lies parallel with the blade, a plurality of longitudinally spaced scarifier teeth fixed to the shaft, arms extending outwardly from the shaft in a direction substantially perpendicular to the teeth, guidebrackets secured to the rear side of the earth scarifying blade near its upper edge, a guide rod pivotally connected to each arm and slidable through a guide bracket, a compression coil spring surrounding each guide rod yieldingly to urge the arms downwardly and the scarifying teeth into earth scarifying position below the lower earth contacting edge of the blade, and a stop mounted on the blade for engagement with each tooth to limit the movement of the teeth toward the earth contacting edge of the blade.

DARL WAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,544,632 Branson July 7, 1925 1,886,438 Weeks, G. M. Nov. 8, 1932 1,929,799. Weeks,E. A Oct. 10, 1933 2,042,196 Senz May 26, 1936 2,073,391 Greene Mar. 9, 1937 2,219,160 White Oct. 22, 1940 2,279,869- Houston Apr. 14, 1942 

